I like to process B&W films scanned with my camera in PL. Just one thing missing is a true inversion.
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You should be able to create whatever inversion you want with the tone curve and save it as a preset.
Yes, but the tone sliders (mid-tones etc.) are reverted.
The sliders would stay that way for sure, but you don’t really need them, if you can assign any input from 0-255 to any output from 0-255 and match the tone response of your film precisely or as precisely as you desire. You would do the same thing to produce digital negatives from a positive image. Unless I completely misunderstand what you are doing.
It would be just more convenient.
You would only need to do it once and save the curve as a preset. You could also use a LUT, but the tone curve is easier, and you don’t need to assign all 255 points. Twenty would be be overkill. Like this.
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Simply take the image from your camera (mine can take TIFFs) …
Invert the tone curve…
… and export to TIFF…
Now you have an inverted image that you can work on as normal.
Thanks. I tried to avoid the intermediate TIFF. But you’re right, it’s the only workaround.
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Now, how about requesting an Optics module for the pinhole? 
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…with a certificate for April fools? I’m all in!
Actually why not? See e.g. Optica Publishing Group for a study on pinhole image restoration using deep learning. Alas, market size may be problematic 
Very interesting. And market size may be large as the pinholes are very low cost, but not for classic photography, indeed.
Here I have made a few standard changes to the tonal values without making any special tonal value changes.
As the negatives are being photographed/scanned with color sensors, you can also proceed with monochrome negatives in the same way as with color negatives. Using the tone value curve, the sliders are shifted color by color until they come as close as possible to the histogram on the horizontal plane. The desired edge value can be controlled by switching on Shadow and Highlight Clipping. In most cases, “colorations” caused by the film are corrected. However, this is at the expense of the “color” characteristics of the negative film. I always use the result as a starting point for making further tonal changes.
I agree, a proper inversion would be useful. I get round it by inverting via the tone curve then taking it into Nik SilverEfex for creative work, but that generates an unwanted tiff.
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What is missing from all these answers is…
The proper way to scan/photograph negatives is to make an image of the film’s emulsion rather than through the film base. This is especially important with colour.
This results in a sharper, cleaner image. However, it also requires that the image be flipped so that left is left and not reversed as if looking in a mirror.
Photolab, after many years of requests, still does not have this ability.
So, while you can fiddle with the Tone Curve to invert the tones, you cannot flip the image. A tool such as Faststone can do this with ease.
When did you last use the menus?
What you are showing is VIEWPOINT.
The Flip feature is not part of PL without spending an extra C$150.
So, why should I spend C$150 + for a simple feature that free software provides?
Perhaps, I have the full package PL, FP and VP.